Pitman.



J. 'r. HAY.

PITMAN.

APPLICATION FILED APR. 24. 1912;

Patented June 23, 1914.

2 SHEETSSHEET 1.

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J. T. HAY.

PITMAN.

Patented June 23, 1914.

2 SHEETS-SEEET 2.

APPLIOATION FILED APR. 24, 1912.

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JOHN T. HAY, OF UNION CITY, OHIO.

PITMAN.

Original application filed October 16, 1911, Serial N 0. 655,018.

Specification of Letters Patent.

Patented June 23, 1914. Divided and this application filed April 24,

1912. Serial No. 692,994.

To all whom it may concern Be it known that I, J OHN T. HAY, a cit1- zen of the United States, residing at Union City, in the county of Darke and State of 01110 have invented certain new and useful Improvements in Pitmen, of which the following is a specification.

This invention is a division of my application for a patent for automatic take-up for journalboxes, filed October 16, 1911, Serial No. (355,018 and the ob ect of this invention is to provide a pitman with adjustable journalboxes at each of its ends, an automatic take-up and release for one set of said journal-boxes, and means extending from the boxes at this last mentioned end to those at the other end of the pitman whereby the boxes at both ends of the pitman will be correspondingly adjusted.

I accomplish the above objects by the mechanism illustrated in the accompanying drawings, in which- Figure l is a view in side elevation of a pitman embodying my invention. Fig. 2 is a View on a larger scale of one end of the same rod shown in Fig. 1. Fig. 3 a View in longitudinal section of a pitman showing a modified form of my device, and Fig. 4: is a view on a larger scale of one end of a pitman having stirrups as shown in Figs. 1 and 2, but with a modification of some of the parts of the automatic take-up and release mechanism.

Like characters of reference indicate like parts throughout the several views of the drawings.

3 is a connecting rod having heads 2, and stirrups L at each end which pass around two-part journal-boxes 5 and 6 to support said boxes in operative position at their respective ends of rod 3. The stems of the stirrups 4L slide loosely in suitable channels in the expanded ends of the rod 3, and stems of the opposing stirrups lap each other and are secured by bolts 7. The movement of one stirrup will correspondingly move the other so that when the journal-boxes become loose the tightening of those at one end will act on the stirrup to transmit movement to the other stirrup and tighten its boxes.

8 is a pin or shaft mounted in the two brasses or box members 9 and 10. The outer face of the outer box member 10 is oblique to its adjacent sides as shown, and a tapering wedge 11 is introduced between the oblique box and stirrup. Liners m may be inserted at the ends of the boxes to fill out excess space.

A lever A is pivoted at 18 to the lower stems of the stirrup and has an extension 15 which bears against the shaft 8, and pivoted at 33 to the lower strap or stirrup A is the lever B having an extension 36 which bears against the shaft 8 at a point diametrically opposite the said bearing 15 from the lever A. The two levers A and B are connected by a rod 38 pivoted at one end to the lever A and having its opposite end extended through a suitable opening in the lever B. This last end of the rod 38 is threaded to receive a nut 39 to regulate the approach of levers A and B, to loosen or tighten the journals.

10 is a nut on the outer end of the rod 38. Between the nut 410 and the lever B is a spirally wound spring 42, which acting through the rod 38 draws the levers A and B toward each other to keep their extensions 15 and 36 in contact with the shaft 8. Pivotally mounted at C in the upper end of the lever B is a bent lever C having its outer arm slotted at cl to receive a pin D which supports the tapering wedge 11. The inner and downwardly bent end of the lever C has a longitudinal slot 0 to receive a transverse pin E. Standards F secured to the upper stem of the stirrup 4: have vertical slots f through which the pin E also passes and the projecting ends of the pin are provided with heads as shown in Fig. 2 to pre vent the longitudinal withdrawal of the pin from said slot. An upward movement of the pin E in slots f and 0 will transmit any pressure and movement from the pin E to the lever G nearer to the fulcrum of said lever, thereby shortening the bent arm of the lever G and correspondingly increasing the travel of the outer arm of said lever. The attached wedge 11 will be raised with a correspondingly greater speed. When the pin E is lowered in said slots f and c the bent arms of the lever C will be correspondingly lengthened causing the outer arm to move a less distance. The raising and lowering of the pin E in the slots f and c is accomplished by the longitudinal movement of a bar Gr having a bent end in which is an oblique slot 9 through which the pin E also passes in the manner shown in Fig. 2. The bent end of the bar G rests upon the base of the standards F and is slotted to loosely receive a bolt 0 which will hold the end of, the bar down and at the sametime'allow it to slide past the bolt 6.

The bar G rests upon a table 72. having sides h extending down and secured to the, upper stem of the'stirrup 4. The sides h are extended upwardly to form'ears H between which a cam I is mounted to bear against the bar Gr. Mounted at the top'of' the 'lever A i's a cam J which also 3 bears aga'nst thetop of thebar G. Both cams I and J are adapted to permit the bar G to move toward the-pin E and willprevent the movement of said bar in the opposite direction. The cam I has an arm extension 71 and the cam J has a like arm "extension j, both arms being on adjacent sides of their cams, and the two arms are =join'ed by'means of a coiled spring K, the extenslon Of'WhlCll, acting through Sitld.

that the action o fthecam "I will permit this movement of the barG toward the pin E. Itwillthus be seen that the bar G is capable of adjustment longitudinally .tO- ward the pin E but that itcannot be moved inthe opposite direction.

Slidingly mounted upon the upperstem of the stirrup 4 below the table I), is a barL. A cam M is mounted'on the table it and bears against the bar Lin a mannerto lock the bar against movement-toward the pin E but permitting it"to move'in the opposite direction. The cam M has an 'arm wt to which a'spring m is connected at one end, the other end of the spring being made fast to the upper stem of the stirrup 4, as shown in'Fig. 1. The'bar Elias a vertical slot'through which the lever A'passes,'the slot being of suificient length to permit of a limited oscillatory movement of the lever A, and mounted'in a suitable socket in'the bar L entering the slot and bearing against the lever A,is a spring N of'less strength than the spring 42 on the rod 38. The tension of the spring N will be regulated by a set-screw a. As the shaft '8 will generally be of soft iron or steel which will wear readily, I prefer to shrink a collar 44: of hardened steel around it for the extensions 15 and 36 to bear against.

The operation of my'invention is as follows: Assuming that the journals'5 and 6 at both ends of the connecting rod have been made t ght ,against their respective shafts or pins'by the introduction of liners m, if

necessary, and that a hearing at either end of 5 or 6 of the connecting rod has become loose by wear, which, because of the stirrup connections loosens the ournals at both ends ofthe'rod,tl1en, by the alternate push and pull of the connecting rod against the shafts at each revolution of the crank, the lovers A and B, tied together by the springtightened'rod 38, will oscillate, and the bar G, by the action of cams "I and J, will he moved toward the pin E raisin'g 'the latter. This has atendency-to swingthe lever C around the pivot c to lower the outer arm of the lever and lower the wedge 11. But this is immediately overcome by the swing of'the le'ver 'Btoward the-shaft 8, toward which it is also drawn by the spring 42' on the rod 38,- and at this inward movement of the lever Bthe Pln'E bGCOlnQS the pivot 'around whiclrthe lever-G swings, and the resulting swing of the latter raises and tightens the wedge 11. The above oscillations Of the levers A, B and'C, will only continue until 'the pin E has reached the point where'it will'raisethe wedge 1L fast enough to take up'all wear, \Vhenthis occurs the levers'A, B and C, cease to oscillate but theywill move only'in' the direction required to raise the wedge 11 snlliciently to take up the existing 'wear. The proper movement of the wedge is determined automatically as abovedcscribed by raising the pin :E, but when the right position of thepin E-is thusfound, the operation of levers A, B and C, will continue to raise the wedge 11 asl'ong as the *relative rate of-wear'on the several boxes IOlllitlllSWlllchanged. Should this again vary, the oscillatory movement of the said levers and the corresponding movement of't'he bar G to raise the pin Ewill again occur. The oscillatory movement ofthe levers A, 'B and C, is occasioned by a wear on the journalboxes at'a faster rate than the wedge or key 11 is moved to take'it up. The tightness of the boxes will be regulated by the tension of the spring 42, as regulated by the nuts 39and 40. Should the journals become too tight, as by the overheating of their shafts, the lever B'will be moved outwardly by the expansion ofthe shaft there by lowering the wedge or key 11 and loosening theboxes. By the cooling of the shaft and its resulting shrinkage, the lever ll will swing back by the action of the spring 42, and the wedge or key 11 will be raised and the journal tightened and a normal condition maintained until the journals become heated again. The bar L can only move toward the cam M, which movement will occur by thepressure against it of the leverv A which will keep the spring N tight against said lever and prevent the rattling of the parts of my device, and also keep the levers A and B from swinging on their pivots toward the wedge 11 by the wearing away of the journal-members, thereby lowering and loosening the wedge 11 instead of causing the levers to oscillate by the action of the spring N against the lever A together with the lateral movement of the shaft. This oscillatory movement advances the bar G and raises the pivotal point E thereby tightening the wedge by the action of the lever G. WVhen by the wear of the journal-boxes the bar L has reached the limit of its longitudinal movement it will be set back by manually releasing it from its cams and additional liners as will be added to tighten the boxes.

In the modification shown in Fig. l the lever C is inverted and the fulcrum is at E instead of at 0 as in Fig. 2, which secures greater leverage in raising the wedge or key 11 and affords a more positive support for the latter. This modification also shows detachable bearing shoes 50 against the collar 44 of the shaft 8 whereby the bearings against the collar may be readily renewed when they become too much worn for good service. In this modification also the arm j of the cam J is moved by a compression spring 70 to tighten the cam. The spring 70 has its upper portion bearing against the arm 7' and its lower bearing against a shoulder extension from the lever A whereby the spring will be carried by the lever A and will not be influenced by the oscillatory movement of the latter. In this modification also the arms 2' and m of the cams I and M are pressed in a direction to tighten said cams by a spring K. Otherwise the mechanism is substantially as described and shown in Fig. 2. I

In the modification shown in Fig. 3 the pitman is made hollow to receive a push bar 52 which terminates at each end against the inner boxes at the opposite ends of the pitman. The stirrups 4 are not connected as shown in Figs. 1, 2 and 4, but are bolted rigidly to the ends of the pitman, in the usual manner. The push-bar 52 will equalize the pressure of the journal-boxes against their shafts at both ends of the pitman substantially in the same manner that this was accomplished by connecting the two-end stirrups.

Having thus fully described my invention, what I claim as new and wish to secure by Letters Patent of the United States, is

1. A pitman, end journal boxes, each in a plurality of members at least one of which is movable, adjustable means to limit and vary by adjustment the tightness of the members on their shaft, automatic means operated by the expansion and contract-ion of the shaft and journal members to secure and constantly maintain the tightness of the members at this limit, and means connecting the journal boxes of the two ends of the pitman whereby a movement of one will correspondingly move the other.

2. The combination, in a pitman, of a pair of shafts, one at each end of the pitman, a plurality of box members for each shaft at least one of which for each shaft is movable and one of which movable box members has an oblique end, holders in which the box members are mounted, a wedge in the holder contacting with the oblique box member to tighten all of the members, means for automatically moving the wedge at any variation from a predetermined pressure of the box members against their shafts to maintain a uniform tightness of journal boxes, means to prevent the movement of the wedge in a direction to loosen it, and means for connecting the box members at the two ends of the pitman to correspondingly move the box members at both ends of the pitman.

3. The combination in a pitman of a pair of shafts one at each end of the pitman, journal boxes for each shaft in a plurality of members at least one of which is movable, means to secure a minimum shaft pressure of said members, automatic means operated by the expansion and contraction of the shaft and journal members to secure and constantly maintain said minimum pressure,

a stirrup at each end of the pitman to hold the journal members, means for connecting the two stirrups whereby a movement of one will correspondingly move the other, and means for varying the distance between a movable journal member and the adjacent stirrup-end.

4:. In a pitman, a rod, a pair of shafts, journal boxes for the shafts at the ends of the rod each in a plurality of members at least one of which is movable, a tightening wedge, stirrups holding the respective journal members and wedge, means contacting with one of the shafts to move the wedge by the expansion and contraction of said parts, and elastic means for maintaining the contact of the journal-members against the shaft.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this 7th day of March, A. D. one thousand nine hundred and twelve.

JOHN T. HAY. [L. s.]

Witnesses:

J. A. MINTURN, F. W. WOERNER.

Copies 01 this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

